US5957191A - Casting method and apparatus using a resin core - Google Patents

Casting method and apparatus using a resin core Download PDF

Info

Publication number
US5957191A
US5957191A US08/707,455 US70745596A US5957191A US 5957191 A US5957191 A US 5957191A US 70745596 A US70745596 A US 70745596A US 5957191 A US5957191 A US 5957191A
Authority
US
United States
Prior art keywords
core
wall
increased thickness
portion
thickness portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/707,455
Inventor
Masamichi Okada
Tatsuhiko Sawamura
Norio Hayashi
Takayuki Ito
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Seiki Co Ltd
Toyota Motor Corp
Original Assignee
Aisin Seiki Co Ltd
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP22839295A priority Critical patent/JPH0970644A/en
Priority to JP7-228392 priority
Application filed by Aisin Seiki Co Ltd, Toyota Motor Corp filed Critical Aisin Seiki Co Ltd
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN SEIKI KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAYASHI, NORIO, ITO, TAKAYUKI, OKADA, MASAMICHI, SAWAMURA, TATSUHIKO
Application granted granted Critical
Publication of US5957191A publication Critical patent/US5957191A/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002Castings of light metals
    • B22D21/007Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/10Cores; Manufacture or installation of cores
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20Accessories: Details
    • B22D17/22Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/24Accessories for locating and holding cores or inserts

Abstract

A casting method and apparatus using a resin core wherein a portion of a wall of the resin core that receives a greater heat and/or load than other portions of the wall of the resin core, is increased in thickness. As a result, even if the resin core receives more heat and/or load in places, a local deformation or breakage of the resin core is effectively prevented.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a casting method and apparatus in which a resin core is used.

2. Description of Related Art

In the die casting of a metal product, a core is used for forming an undercut portion and a vacant interior of the product. In a gravity die casting process, a sand core is usually used because the sand core can be easily removed from the product after casting because it collapses easily.

Recently, a resin core was proposed, for example, in Japanese Patent Publication No. HEI 6-91345, with a core made from thermoplastic resin that was removed from a product by heating the core and thereby melting the resin core. In order to prevent some of the melted resin from remaining in the product, a resin core removal method is proposed in Japanese Patent Application No. HEI 7-164299 where the resin core, having a substantially uniform wall thickness, is taken out of the cast metal product by drawing before it is melted so that the drawing force can be transmitted in the resin core and the entire portion of the resin core can be taken out of the cast metal product.

The above-described resin core, with a wall having a substantially uniform thickness, still has the following problems.

In a case where a cast metal product has a relatively thick portion (large thermal capacity portion), a portion of the resin core contacting the relatively thick portion of the cast metal product tends to be melted by receiving residual heat from the cast metal product. If this melting occurs, the accuracy of the shape and the dimensions of the portion of the cast metal product that contacts the melted portion of the core will be compromised.

A shrinkage recess or cavity may also be caused in a surface of a portion of the cast metal product that contacts the resin core when the portion is solidified after the other portions of the metal product.

Furthermore, the resin core may be destroyed in places if a load acting on a portion of the resin core from the molten metal, which flows into a molding cavity at a high speed and at a high pressure, exceeds the strength of the portion of the resin core.

The resin core may also be destroyed in places if a load acting on a portion of the resin core from a pressure pin exceeds the strength of the portion of the resin core.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a casting method and apparatus using a resin core which is unlikely to be destroyed even if it receives a large heat and/or load.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features, and advantages of the present invention will become more apparent and will be more readily appreciated from the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of a resin core during manufacturing, used in a casting method and apparatus according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view of the resin core of FIG. 1 after manufacturing;

FIG. 3 is a cross-sectional view of a resin core and a cast metal product showing a casting method and apparatus according to a second embodiment of the present invention;

FIG. 4 is a cross-sectional view of a resin core and a cast metal product showing a casting method and apparatus according to a third embodiment of the present invention;

FIG. 5 is a cross-sectional view of a resin core and a cast metal product showing that an increased thickness portion is not formed in the resin core and that a shrinkage defect is generated in the cast metal product;

FIG. 6 is a cross-sectional view of a resin core and a molten metal injection gate showing a casting method and apparatus according to a fourth embodiment of the present invention;

FIG. 7 is a cross-sectional view of a resin core and a pressure pin showing a casting method and apparatus according to a fifth embodiment of the present invention;

FIG. 8 is a cross-sectional view of a casting apparatus showing a casting method applicable to virtually any embodiment of the present invention; and

FIG. 9 is a graph showing the relationship between the temperatures of the resin core and the cast metal product with the elapsed time applicable to any embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1 and 2 illustrate a first embodiment of the present invention; FIG. 3 illustrates a second embodiment of the present invention; FIGS. 4 and 5 illustrate a third embodiment of the present invention; FIG. 6 illustrates a fourth embodiment of the present invention; and FIG. 7 illustrates a fifth embodiment of the present invention. FIGS. 8 and 9 are applicable to virtually any embodiment of the present invention. Portions common or similar to all of the embodiments of the present invention are denoted with the same reference numerals throughout all of the embodiments of the present invention.

First, portions common or similar to all of the embodiments of the present invention will be explained with reference to, for example, FIGS. 1, 2, 8 and 9.

FIG. 8 shows an apparatus for producing a cast metal product including a mold 8 and a core 1 set within the mold 8. The mold 8 and the core 1 define a molding cavity 9 for molding a cast metal product 4. The core 1 is made from thermoplastic resin. The core 1 includes a wall 3 defining a vacant interior 2 within the wall 3 so that the resin core 1 can be deformed utilizing the vacant interior when the resin core 1 is removed from the cast metal product 4 after molding. The wall 3 of the core 1 includes at least one increased thickness portion 3a which is increased in thickness compared with portions 3b of the wall 3. The increased thickness portion 3a of the wall 3 is formed in a portion where the wall 3 receives greater heat and/or load greater than other portions 3b of the wall 3 of the resin core 1.

The resin core 1 includes divided parts 1a and 1b which are formed using injection molding, and adhered to each other to complete the core 1. Each of the parts 1a and 1b can be formed to a desired wall thickness at a desired portion of the core.

As shown in FIG. 8, the resin core 1 is set within the mold 8 to thereby form the molding cavity 9. The mold 8 may be provided with a pressure pin 7. The core 1 includes the wall 3 defining a vacant interior therein, and the wall 3 of the core 1 includes at least one increased thickness portion 3a compared with portions 3b of the wall. Then, molten metal 6, for example molten aluminum alloy, is supplied into the molding cavity 9 at a high pressure (for example, at a pressure above 80 MPa) or at a low pressure. When the molten metal solidifies, a cast metal product 4 is produced.

The core 1 forms an undercut portion or a hollow portion in the cast metal product 4. After the supplied metal has solidified, the mold 8 is opened and the cast metal product 4 is taken out from the mold 8. Then, the resin core 1 is removed from the cast metal product 4 by deforming the resin core 1 through a hole formed in the cast metal product 4. The removed core is recycled as a material for a new resin core.

When removing the resin core 1 from the cast metal product, the resin core 1 is softened by the residual heat from the cast metal product 4 or by reheating the resin core and the metal product, but not enough to melt the cast metal product 4. Because the resin core 1 is not yet completely melted, the resin core 1 can transmit the drawing load and the entire portion of the resin core 1 can be drawn out of the cast metal product 4. Therefore, unlike a completely melted resin core 1, a portion of the resin does not remain in the cast metal product.

FIG. 9 illustrates the relationship between a temperature change of the resin core and a temperature change of the molten metal in the case where the molten metal is aluminum alloy. More particularly, when the molten aluminum alloy is supplied into the molding cavity, the temperature of the molten aluminum alloy during the time period from t1 to t2 is about 700° C., and the temperature of the molten metal aluminum alloy decreases to about 550° C. within 10 seconds and 3 minutes. The time varies according to a volume of the cast metal product 4.

On the other hand, the temperature of the resin core 1 rises as it receives the heat from the molten metal. As shown, the temperature of the resin core 1 has not yet risen to the beginning of the softening of the resin (about 150° C.) at a solidification completing time t3 of the molten metal. Therefore, the molten metal completes its solidification while the resin core 1 is in a solid state. As a result, the resin core 1 is unlikely to cause a deformation even if it receives a high pressure of high load from the molten metal, so that a cast metal product 4 having a better dimensional accuracy can be obtained.

The resin core 1 then rises in temperature and begins to soften at the softening beginning point (about 150° C.).

After the solidification completing time t3 the mold 8 is opened and preferably at a time after the softening beginning time of the resin core. Removing the resin core 1 from the cast metal product 4 is performed after the mold opening time t4 and before the resin core 1 is completely melted, that is, while the resin core 1 is in a softened state (in a case of a crystal-type resin, before the core 1 is melted). In this regard, the softened state means that an elastic rate of the resin is in the approximate range of 10-2 -10-5 GPa. Because the resin core 1 is softened but not melted, the resin core 1 itself can transmit the drawing force (tension), so that the entire resin core 1 can be drawn without causing a breakage within the cast metal product and without remaining within the cast metal product. The thermoplastic resin showing the above-described softening and melting characteristics best includes crystal resins such as polypropylene and non-crystal-plastics, for example, polycarbonate, polystyrene (high impact polystyrene), and ABS resin, though the non-crystal-plastics do not have a melting point.

The wall 3 of the resin core 1 includes the increased thickness portion 3a at a portion where the wall 3 receives a greater load and/or heat than other portions 3b of the wall 3. Therefore, the resin core 1 is unlikely to cause a deformation and breakage at the increased thickness portion 3a when the core 1 receives a load and heat from the molten metal supplied into the molding cavity. As a result, deformation of the cast metal product 4 will also be prevented at the portion of the product corresponding to the increased thickness portion 3a of the core 1. Furthermore, since the wall 3 of the core 1 is increased in thickness only locally, costs for the resin core 1 can be suppressed.

Portions unique to each embodiment will be now explained.

In the first embodiment of the present invention, as illustrated in FIGS. 1 and 2, the resin core 1 includes two parts 1a and 1b which define a vacant interior 2 therein when the two parts are joined to each other. The wall 3 of the core 1 includes a plurality of increased thickness portions 3a which can be formed due to the two part structure of the core.

In the second embodiment of the present invention, as illustrated in FIG. 3, the cast metal product 4 includes an increased thickness portion 4a. A portion of the wall 3 of the resin core 1 contacts the increased thickness portion 4a of the cast metal product 4. The increased thickness portion 3a of the wall 3 of the resin core 1 is formed in the portion of the wall 3 that contacts the increased thickness portion 4a of the cast metal product 4.

Though the increased thickness portion 4a of the cast metal product 4 gives a greater heat to the resin core 1 than other thinner portions of the cast metal product, the core 1 also is thickened to have a large heat resistance at the portion corresponding to the increased thickness portion 4a so that the core 1 can endure the heat and load.

As a result, the increased thickness portion 3a of the wall 3 of the core 1 is unlikely to be softened before the molten metal has solidified and therefore, a better dimensional accuracy of the cast metal product 4 can be obtained.

In the third embodiment of the present invention, as illustrated in FIGS. 4 and 5, the cast metal product 4 includes a rib 4b having a root 4c. A portion of the wall 3 of the resin core 1 contacts the root 4c of the rib 4b of the cast metal product 4. The increased thickness portion 3a is formed in the portion of the wall 3 that contacts the root 4c so as to protrude into the root 4c of the rib 4b.

As shown in FIG. 5, the root 4c of the rib 4b has a greater thickness or volume than other portions of the cast metal product 4 so that it solidifies later than other portions of the cast metal product 4 and a shrinkage hole 4d is likely to be caused. In FIG. 4, however, the protruding portion 3b contacts and pushes the root 4c of the rib 4b of the cast metal product 4, a shrinkage hole 4d is prevented.

In the fourth embodiment of the present invention, as illustrated in FIG. 6, the mold 8 includes a molten metal injection gate 5 through which the molten metal 6 is supplied into a molding cavity 9. The increased thickness portion 3a of the wall 3 of the resin core 1 is formed in the portion of the wall 3 of the resin core 1 opposing the molten metal injection gate 5.

In die casting the molten metal 6 is usually supplied into the molding cavity at a high speed, as high as about 40 m/sec, and at a high pressure, as high as about 80 MPa, the portion of the core 1 opposing the injection gate 5 is likely to receive a large load and heat from the supplied molten metal and therefore to break. However, since the portion of the core 1 opposing the injection gate 5 is increased in thickness, that portion of the core 1 can endure the load and heat and thereby prevent breakage of the resin core 1.

In the fifth embodiment of the present invention, as illustrated in FIG. 7, the casting apparatus includes a pressure pin 7 which penetrates the casting mold 8 so that the pressure pin 7 can press a portion of the molten metal having a great volume (a portion likely corresponding to the increased thickness portion of the cast metal product) before the metal solidifies. A portion of the wall 3 of the resin core 1 opposes the pressure pin 7. The increased thickness portion 3a of the wall 3 is formed to oppose the pressure pin 7.

When the pressure pin 7 presses the molten metal, the portion of the wall 3 that opposes the pressure pin 7 also receives the pressing force of the pressure pin 7. However, since the portion of the core 1 is increased in thickness 3a, it can endure the pressing force of the pressure pin 7 and prevent damage or deformation of the resin core 1.

According to the present invention, the following advantages can be obtained.

First, the resin core 1 can effectively endure the heat and/or load since the wall 3 of the resin core 1 is increased in thickness in places.

Second, the wall 3 of the resin core 1 is increased in thickness only in certain places and therefore, the increase in manufacturing cost of the resin core 1 is minimized.

Although the present invention has been described with reference to specific exemplary embodiments, it will be appreciated by those skilled in the art that various modifications and alterations can be made to the particular embodiments shown, without materially departing from the novel teachings and advantages of the present invention. Accordingly, it is to be understood that all such modifications and alterations are included within the spirit and scope of the present invention as defined by the following claims.

Claims (10)

What is claimed is:
1. An apparatus for producing a cast metal product comprising:
a mold having an inner surface; and
a thermoplastic resin core including a wall having an inner wall surface and an outer wall surface, said inner wall surface defining a vacant interior therein, said wall of said core including at least one increased thickness portion which has a greater thickness, defined as a distance between said inner wall surface and said outer wall surface, than portions of said wall surrounding said increased thickness portion,
wherein said core is set mostly within said mold so as to provide a molding cavity between said inner surface of said mold and said outer wall surface of said wall, and said increased thickness portion of said wall of said core is provided at a portion of said wall where said wall receives greater heat or load than other portions of said wall.
2. An apparatus according to claim 1, wherein said molding cavity has an increased thickness portion having a greater thickness, defined as a distance between said inner surface of said mold and said outer wall surface of said wall of said core, than portions of said molding cavity surrounding said increased thickness portion of said molding cavity, and said increased thickness portion of said wall of said core is formed to correspond to said increased thickness portion of said molding cavity.
3. An apparatus according to claim 1, wherein said molding cavity is shaped to form said cast metal product to include a rib having a root, said increased thickness portion of said wall of said core is formed towards said molding cavity at a portion of said wall of said core to correspond with said root so as to protrude into said root of said rib.
4. An apparatus according to claim 1, wherein said mold includes a molten metal injection gate, and said increased thickness portion of said wall of said core is formed towards said vacant interior of said core at a portion of said wall of said core that opposes said molten metal injection gate.
5. An apparatus according to claim 1, wherein said casting apparatus includes a pressure pin, and said increased thickness portion of said wall of said core is formed towards said vacant interior of said core at a portion of said wall of said core that opposes said pressure pin.
6. A method for producing a cast metal product comprising the following steps of:
setting a thermoplastic resin core with a wall having an inner wall surface and outer wall surface within a mold having an inner surface to thereby form a molding cavity between said inner surface of said mold and said outer wall surface of said core, said inner wall surface of said wall of said core defining a vacant interior therein, said wall of said core including at least one increased thickness portion which has a greater thickness, defined as a distance between said inner wall surface and said outer wall surface, than portions of said wall surrounding said increased thickness portion;
supplying molten metal into said molding cavity, said molten metal solidifying to form said cast metal product;
opening said mold and removing said cast metal product including said core therein; and
removing said core from said cast metal product before said core is completely melted.
7. A method according to claim 6, wherein said molding cavity has an increased thickness portion having a greater thickness, defined as a distance between said inner surface of said mold and said outer wall surface of said wall of said core, than portions of said molding cavity surrounding said increased thickness portion of said molding cavity, and said increased thickness portion of said wall is formed to correspond to said increased thickness portion of said molding cavity.
8. A method according to claim 6, wherein said molding cavity is shaped to form said cast metal product to include a rib having a root, said increased thickness portion of said wall of said core is formed towards said molding cavity at a portion of said wall of said core to correspond with said root so as to protrude into said root of said rib.
9. A method according to claim 6, wherein said mold includes a molten metal injection gate, and said increased thickness portion of said wall of said core is formed towards said vacant interior of said core at a portion of said wall of said core that opposes said molten metal injection gate.
10. A method according to claim 6, wherein said casting apparatus includes a pressure pin, and said increased thickness portion of said wall of said core is formed towards said vacant interior of said core at a portion of said wall of said core that opposes said pressure pin.
US08/707,455 1995-09-05 1996-09-04 Casting method and apparatus using a resin core Expired - Fee Related US5957191A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP22839295A JPH0970644A (en) 1995-09-05 1995-09-05 Resin core
JP7-228392 1995-09-05

Publications (1)

Publication Number Publication Date
US5957191A true US5957191A (en) 1999-09-28

Family

ID=16875755

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/707,455 Expired - Fee Related US5957191A (en) 1995-09-05 1996-09-04 Casting method and apparatus using a resin core

Country Status (3)

Country Link
US (1) US5957191A (en)
JP (1) JPH0970644A (en)
DE (1) DE19635920C2 (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8724302B2 (en) 2012-03-02 2014-05-13 Microsoft Corporation Flexible hinge support layer
US8733423B1 (en) * 2012-10-17 2014-05-27 Microsoft Corporation Metal alloy injection molding protrusions
US8850241B2 (en) 2012-03-02 2014-09-30 Microsoft Corporation Multi-stage power adapter configured to provide low power upon initial connection of the power adapter to the host device and high power thereafter upon notification from the host device to the power adapter
US8873227B2 (en) 2012-03-02 2014-10-28 Microsoft Corporation Flexible hinge support layer
US9027631B2 (en) 2012-10-17 2015-05-12 Microsoft Technology Licensing, Llc Metal alloy injection molding overflows
US9064654B2 (en) 2012-03-02 2015-06-23 Microsoft Technology Licensing, Llc Method of manufacturing an input device
US9075566B2 (en) 2012-03-02 2015-07-07 Microsoft Technoogy Licensing, LLC Flexible hinge spine
US9073123B2 (en) 2012-06-13 2015-07-07 Microsoft Technology Licensing, Llc Housing vents
CN105188988A (en) * 2013-03-15 2015-12-23 联合工艺公司 Cast component having corner radius to reduce recrystallization
US9354748B2 (en) 2012-02-13 2016-05-31 Microsoft Technology Licensing, Llc Optical stylus interaction
US9360893B2 (en) 2012-03-02 2016-06-07 Microsoft Technology Licensing, Llc Input device writing surface
US9426905B2 (en) 2012-03-02 2016-08-23 Microsoft Technology Licensing, Llc Connection device for computing devices
US9432070B2 (en) 2012-10-16 2016-08-30 Microsoft Technology Licensing, Llc Antenna placement
US9759854B2 (en) 2014-02-17 2017-09-12 Microsoft Technology Licensing, Llc Input device outer layer and backlighting
US9824808B2 (en) 2012-08-20 2017-11-21 Microsoft Technology Licensing, Llc Switchable magnetic lock
US9870066B2 (en) 2012-03-02 2018-01-16 Microsoft Technology Licensing, Llc Method of manufacturing an input device
US10120420B2 (en) 2014-03-21 2018-11-06 Microsoft Technology Licensing, Llc Lockable display and techniques enabling use of lockable displays
US10156889B2 (en) 2014-09-15 2018-12-18 Microsoft Technology Licensing, Llc Inductive peripheral retention device
US10324733B2 (en) 2014-07-30 2019-06-18 Microsoft Technology Licensing, Llc Shutdown notifications

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601318B (en) * 2011-12-15 2013-12-11 宁夏共享集团有限责任公司 Casting method for thin-wall annular cast
JP5827644B2 (en) * 2013-06-27 2015-12-02 シナノケンシ株式会社 Casting parts manufacturing method

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093175A (en) * 1973-10-03 1978-06-06 Precision Flexmold, Inc. Distensible elastomeric molds
US4927688A (en) * 1986-12-15 1990-05-22 Eisengiesserei Monforts Gmbh & Co. Cast-iron element
US5285840A (en) * 1991-09-30 1994-02-15 Aisin Seiki Kabushiki Kaisha Method and apparatus for manufacturing piston of internal combustion engine
JPH0691345A (en) * 1992-07-30 1994-04-05 Masaru Nemoto Special core for casting
JPH0699247A (en) * 1992-08-03 1994-04-12 Masaru Nemoto Casting method using special core
JPH0699436A (en) * 1992-08-03 1994-04-12 Masaru Nemoto Molding method using special core
JPH06122037A (en) * 1992-07-30 1994-05-06 Masaru Nemoto Special core for casting
JPH06126376A (en) * 1992-07-30 1994-05-10 Masaru Nemoto Special core for casting
JPH06198388A (en) * 1992-08-03 1994-07-19 Masaru Nemoto Molding method using special core for molding
JPH06292941A (en) * 1992-07-30 1994-10-21 Masaru Nemoto Cast product cast by using special core
JPH06328195A (en) * 1993-05-20 1994-11-29 Calp Corp Core and manufacture of molding using the core
JPH071080A (en) * 1992-07-30 1995-01-06 Masaru Nemoto Special molding core
JPH071079A (en) * 1992-07-30 1995-01-06 Masaru Nemoto Special molding core
JPH07195144A (en) * 1993-12-29 1995-08-01 Masaru Nemoto Special core for molding
JPH07195145A (en) * 1993-12-29 1995-08-01 Masaru Nemoto Special core for molding
JPH07195147A (en) * 1993-12-29 1995-08-01 Masaru Nemoto Molding method using special core for molding
JPH0890158A (en) * 1994-07-11 1996-04-09 Toyota Motor Corp Core and removing method thereof
US5566742A (en) * 1994-04-13 1996-10-22 Nemoto; Masaru Casting method using core made of synthetic resin, core made of synthetic resin, and cast product

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU677903B2 (en) * 1994-06-01 1997-05-08 Toyota Jidosha Kabushiki Kaisha Casting method with improved resin core removing step and apparatus for performing the method

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093175A (en) * 1973-10-03 1978-06-06 Precision Flexmold, Inc. Distensible elastomeric molds
US4927688A (en) * 1986-12-15 1990-05-22 Eisengiesserei Monforts Gmbh & Co. Cast-iron element
US5285840A (en) * 1991-09-30 1994-02-15 Aisin Seiki Kabushiki Kaisha Method and apparatus for manufacturing piston of internal combustion engine
JPH0691345A (en) * 1992-07-30 1994-04-05 Masaru Nemoto Special core for casting
JPH071079A (en) * 1992-07-30 1995-01-06 Masaru Nemoto Special molding core
JPH071080A (en) * 1992-07-30 1995-01-06 Masaru Nemoto Special molding core
JPH06122037A (en) * 1992-07-30 1994-05-06 Masaru Nemoto Special core for casting
JPH06126376A (en) * 1992-07-30 1994-05-10 Masaru Nemoto Special core for casting
JPH06292941A (en) * 1992-07-30 1994-10-21 Masaru Nemoto Cast product cast by using special core
JPH06198388A (en) * 1992-08-03 1994-07-19 Masaru Nemoto Molding method using special core for molding
JPH0699436A (en) * 1992-08-03 1994-04-12 Masaru Nemoto Molding method using special core
JPH0699247A (en) * 1992-08-03 1994-04-12 Masaru Nemoto Casting method using special core
JPH06328195A (en) * 1993-05-20 1994-11-29 Calp Corp Core and manufacture of molding using the core
JPH07195144A (en) * 1993-12-29 1995-08-01 Masaru Nemoto Special core for molding
JPH07195145A (en) * 1993-12-29 1995-08-01 Masaru Nemoto Special core for molding
JPH07195147A (en) * 1993-12-29 1995-08-01 Masaru Nemoto Molding method using special core for molding
US5566742A (en) * 1994-04-13 1996-10-22 Nemoto; Masaru Casting method using core made of synthetic resin, core made of synthetic resin, and cast product
JPH0890158A (en) * 1994-07-11 1996-04-09 Toyota Motor Corp Core and removing method thereof

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9354748B2 (en) 2012-02-13 2016-05-31 Microsoft Technology Licensing, Llc Optical stylus interaction
US9710093B2 (en) 2012-03-02 2017-07-18 Microsoft Technology Licensing, Llc Pressure sensitive key normalization
US8850241B2 (en) 2012-03-02 2014-09-30 Microsoft Corporation Multi-stage power adapter configured to provide low power upon initial connection of the power adapter to the host device and high power thereafter upon notification from the host device to the power adapter
US8854799B2 (en) 2012-03-02 2014-10-07 Microsoft Corporation Flux fountain
US8873227B2 (en) 2012-03-02 2014-10-28 Microsoft Corporation Flexible hinge support layer
US8947864B2 (en) 2012-03-02 2015-02-03 Microsoft Corporation Flexible hinge and removable attachment
US9904327B2 (en) 2012-03-02 2018-02-27 Microsoft Technology Licensing, Llc Flexible hinge and removable attachment
US9870066B2 (en) 2012-03-02 2018-01-16 Microsoft Technology Licensing, Llc Method of manufacturing an input device
US9064654B2 (en) 2012-03-02 2015-06-23 Microsoft Technology Licensing, Llc Method of manufacturing an input device
US9075566B2 (en) 2012-03-02 2015-07-07 Microsoft Technoogy Licensing, LLC Flexible hinge spine
US9852855B2 (en) 2012-03-02 2017-12-26 Microsoft Technology Licensing, Llc Pressure sensitive key normalization
US9111703B2 (en) 2012-03-02 2015-08-18 Microsoft Technology Licensing, Llc Sensor stack venting
US9134808B2 (en) 2012-03-02 2015-09-15 Microsoft Technology Licensing, Llc Device kickstand
US9134807B2 (en) 2012-03-02 2015-09-15 Microsoft Technology Licensing, Llc Pressure sensitive key normalization
US9146620B2 (en) 2012-03-02 2015-09-29 Microsoft Technology Licensing, Llc Input device assembly
US10013030B2 (en) 2012-03-02 2018-07-03 Microsoft Technology Licensing, Llc Multiple position input device cover
US9176900B2 (en) 2012-03-02 2015-11-03 Microsoft Technology Licensing, Llc Flexible hinge and removable attachment
US9176901B2 (en) 2012-03-02 2015-11-03 Microsoft Technology Licensing, Llc Flux fountain
US9793073B2 (en) 2012-03-02 2017-10-17 Microsoft Technology Licensing, Llc Backlighting a fabric enclosure of a flexible cover
US9268373B2 (en) 2012-03-02 2016-02-23 Microsoft Technology Licensing, Llc Flexible hinge spine
US9158384B2 (en) 2012-03-02 2015-10-13 Microsoft Technology Licensing, Llc Flexible hinge protrusion attachment
US9360893B2 (en) 2012-03-02 2016-06-07 Microsoft Technology Licensing, Llc Input device writing surface
US9426905B2 (en) 2012-03-02 2016-08-23 Microsoft Technology Licensing, Llc Connection device for computing devices
US9766663B2 (en) 2012-03-02 2017-09-19 Microsoft Technology Licensing, Llc Hinge for component attachment
US9460029B2 (en) 2012-03-02 2016-10-04 Microsoft Technology Licensing, Llc Pressure sensitive keys
US9465412B2 (en) 2012-03-02 2016-10-11 Microsoft Technology Licensing, Llc Input device layers and nesting
US9619071B2 (en) 2012-03-02 2017-04-11 Microsoft Technology Licensing, Llc Computing device and an apparatus having sensors configured for measuring spatial information indicative of a position of the computing devices
US9618977B2 (en) 2012-03-02 2017-04-11 Microsoft Technology Licensing, Llc Input device securing techniques
US9678542B2 (en) 2012-03-02 2017-06-13 Microsoft Technology Licensing, Llc Multiple position input device cover
US8724302B2 (en) 2012-03-02 2014-05-13 Microsoft Corporation Flexible hinge support layer
US9073123B2 (en) 2012-06-13 2015-07-07 Microsoft Technology Licensing, Llc Housing vents
US9824808B2 (en) 2012-08-20 2017-11-21 Microsoft Technology Licensing, Llc Switchable magnetic lock
US9432070B2 (en) 2012-10-16 2016-08-30 Microsoft Technology Licensing, Llc Antenna placement
US8991473B2 (en) 2012-10-17 2015-03-31 Microsoft Technology Holding, LLC Metal alloy injection molding protrusions
US9027631B2 (en) 2012-10-17 2015-05-12 Microsoft Technology Licensing, Llc Metal alloy injection molding overflows
US8733423B1 (en) * 2012-10-17 2014-05-27 Microsoft Corporation Metal alloy injection molding protrusions
CN105188988A (en) * 2013-03-15 2015-12-23 联合工艺公司 Cast component having corner radius to reduce recrystallization
US9759854B2 (en) 2014-02-17 2017-09-12 Microsoft Technology Licensing, Llc Input device outer layer and backlighting
US10120420B2 (en) 2014-03-21 2018-11-06 Microsoft Technology Licensing, Llc Lockable display and techniques enabling use of lockable displays
US10324733B2 (en) 2014-07-30 2019-06-18 Microsoft Technology Licensing, Llc Shutdown notifications
US10156889B2 (en) 2014-09-15 2018-12-18 Microsoft Technology Licensing, Llc Inductive peripheral retention device

Also Published As

Publication number Publication date
DE19635920A1 (en) 1997-03-06
JPH0970644A (en) 1997-03-18
DE19635920C2 (en) 1998-12-17

Similar Documents

Publication Publication Date Title
EP0696955B1 (en) Moulded photochromic lens and method of making same
US4490315A (en) Methods of moulding of plastics articles
CN1092586C (en) Hollow crank for bicycle and its producing method
EP0493447B1 (en) Method for the use of gas assistance in the molding of plastic articles
US5303761A (en) Die casting using casting salt cores
US5415817A (en) Process for molding plastic lenses
US4948547A (en) Method for the use of gas assistance in the molding of plastic articles
EP0495614B1 (en) Method of injection molding a thermoplastic resin and a mold for injection molding
JP3843705B2 (en) Laminating molding method
US5718850A (en) Method and device for manufacturing optical elements
CN1162855C (en) Method for forming thin wall member
JPH06244355A (en) Forming for pin hold part in lead frame, resin leakage-preventive part, and heat sink fixing part in ic
JP3421075B2 (en) Caulking method and the fastening of the thermoplastic resin member
JP2907016B2 (en) Optical element
US5597523A (en) Molding apparatus and method in which a mold cavity gasket is deformed by separately applied pressure
WO2005084909A1 (en) Mold support device, molding machine, and molding method
EP0355974A3 (en) Method of making a hollow plastic article
US4826641A (en) Injection molding process
JP4776751B2 (en) Magnesium alloy sheet manufacturing method
CN1119972A (en) Casting method with improved resin core removing step and apparatus for performing the method
US1554697A (en) Manufacture of hollow articles
KR100237564B1 (en) Mould for semiconductor package forming
CN100376375C (en) Optical unit, and its product, metal mould for product and product jet-forming method
US20010001978A1 (en) Electronic apparatus, manufacturing method therefor, and mold device
US20030070785A1 (en) Method for injection molding metallic materials

Legal Events

Date Code Title Description
AS Assignment

Owner name: AISIN SEIKI KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKADA, MASAMICHI;SAWAMURA, TATSUHIKO;HAYASHI, NORIO;AND OTHERS;REEL/FRAME:008247/0504;SIGNING DATES FROM 19960829 TO 19960902

Owner name: TOYOTA JIDOSHA KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OKADA, MASAMICHI;SAWAMURA, TATSUHIKO;HAYASHI, NORIO;AND OTHERS;REEL/FRAME:008247/0504;SIGNING DATES FROM 19960829 TO 19960902

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Expired due to failure to pay maintenance fee

Effective date: 20070928